Orange-red vat dye.



I No Drawing.

7 sulfite solution,

' ARTHUR IJUTTRINGHAUS AND HEINRICH VON DIESBAGH, OF MANNHEIM, A$SIGNDRSTO BADISCHE ANILIN & SODA FABRIK, OF LUDWIGSHAFEN-ON-THE- BHINE, GEEIMANY, ACORPORA'IION OF GERMANY.

ORANGE-RED VAT DYE.

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We can prepare our new coloring matter loy first. treating 1-chlor-anthraquinone-- carboxylic acid With 'para-thio-cresoland then treating the product with a condensing agent such, for instance, as phosphorus pentachlorid, until a thioxanthone ring is formed.

Our new coloring matter'consista when dry, of a red powder, and, in the pure state, has a percentage composition correspond ing to the above formula. It yields an intense carmine red solution in concentrated sulfuric acid, a violet vat in alkaline hydroand dyes cotton from this vat orange-red shades of excellent fastness I against the action of chlorin and light.

The following example will serve to illustrate further the nature of this invention,

which, however, is not confined to this ex ample. The parts are by Weight. Boil together', for 3 hours, in a reflux apparatus, while excluding air, 29 parts of l-chloranthraquinone-2-carboxylic acid, 12.4 parts of parathio-cresol, 12 parts of caustic potash and 300 parts of water. Then filter and acidifythe filtrate with dilute acetic acid. Filter of? the para-tolyl-thio'1-anthraqui- Specification of Letters Patent.

Application filed November 3, 1911. Serial No. 658,386.

none-f2-carboxylic acid and wash and dry it. It is an orange powder which yields a yellowish red solution in alkalis and a dull green solution in cold concentrated sulfuric acid, which solution rapidly turns brownred. Introduce'lO parts of'this para-tolylthin-1-anthraquinone-2-carboxylic acid into PatentedFeb. 27,1912.

130 parts of trichlor-benzene. Add 8 parts of phosphorus pentachlorid and heat the mixture, on the water-bath, until'the formation of the acid chlorid is complete. Then boil for from 1 to 2 hours. On cooling, the

anthraquinone-thioxanthone derivative sop-- arates out in the form of dark red needles. It yields a brownish solution ln organic solvents of high boiling pomtJand an 1ntense carmine red solution in concentrated sulfuric acid. It dissolves in alkaline hydrosulfite solution. to a violet vat and dyes cotton orange-red shades of excellent fast ness.

Now what we-claim is The vat coloring matter which possesses a percentage compositioncorresponding to the formula which coloring matter consists, When'dry, of a red POWClGfWhlCh yields a carmine red solution in concentrated sulfuric acld, a

' violet vat in alkaline hydrosulfite' solution,

and which dyes cotton from this vat orangered shades of excellent fastness against the action of chlorin and light.

In testimony whereof We have hereunto set our hands in the presence of two subscribing witnesses.

ARTHURv LUTTRINGHAUS. HEINRICH VON DIESBACH.. Witnesses:

J. Anne. LLOYD, JOSEPH PFEIFFER. 

